Join incompatibility between RHEL 6 and RHEL 7
Environment
- Red Hat Enterprise Linux (RHEL) 6
- Red Hat Enterprise Linux (RHEL) 7
- coreutils-8.4-46.el6 or older
Issue
Our users report incompatibility in join command between RHEL 6 and RHEL 7.
- On
RHEL 6:
# echo a b | join -v 2 -1 1 -2 2 /dev/null -
a b
- On
RHEL7:
# echo a b | join -v 2 -1 1 -2 2 /dev/null -
b a
This leads to unexpected scripts behaviour
Resolution
Update to coreutils-8.4-47.el6 released with Advisory RHBA-2018:1862 or newer.
Root Cause
There had been a join bug in coreutils since the very beginning, fixed in coreutils-8.10, see corresponding changelog record:
join -v2 now ensures the default output format prints the match field
at the start of the line when it is different to the match field for
the first file. [bug present in "the beginning".]
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